24C01.PDF

Any device on the system bus receiving data when com-municating with the E2PROM must pull the SDA bus low to acknowledge that it has successfully received each word.. Upon receipt of thi

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2-Wire Serial CMOS

1K (128 x 8)

Features

• Low Voltage and Standard Voltage Operation

5.0 (V CC = 4.5V to 5.5V)

2.7 (V CC = 2.7V to 5.5V)

2.5 (V CC = 2.5V to 5.5V)

1.8 (V CC = 1.8V to 5.5V)

• Internally Organized 128 x 8

• 2-Wire Serial Interface

• Bidirectional Data Transfer Protocol

• 100 kHz (1.8V, 2.5V, 2.7V) and 400 kHz (5V) Compatibility

• 4-Byte Page Write Mode

• Self-Timed Write Cycle (10 ms max)

• High Reliability

Endurance: 1 Million Cycles

Data Retention: 100 Years

• Automotive Grade and Extended Temperature Devices Available

• 8-Pin PDIP and JEDEC SOIC Packages

Description

The AT24C01 provides 1024 bits of serial electrically erasable and programmable

read only memory (EEPROM) organized as 128 words of 8 bits each The device is

optimized for use in many industrial and commercial applications where low power

and low voltage operation are essential The AT24C01 is available in space saving

8-pin PDIP and 8-pin SOIC packages and is accessed via a 2-wire serial interface In

addition, the entire family is available in 5.0V (4.5V to 5.5V), 2.7V (2.7V to 5.5V), 2.5V

(2.5V to 5.5V) and 1.8V (1.8V to 5.5V) versions

Pin Name Function

NC No Connect

SDA Serial Data

SCL Serial Clock Input

Test Test Input (GND or V CC )

Pin Configurations

0134B

AT24C01

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Block Diagram

Storage Temperature -65°C to +150°C

Voltage on Any Pin

with Respect to Ground -0.1V to +7.0V

Maximum Operating Voltage 6.25V

DC Output Current 5.0 mA

This is a stress rating only and functional operation of the device at these or any other conditions beyond those indi-cated in the operational sections of this specification is not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability

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Applicable over recommended operating range from: TAI = -40°C to +85°C, VCC = +1.8V to +5.5V, TAC = 0°C to +70°C,

VCC = +1.8V to +5.5V (unless otherwise noted)

ISB1 Standby Current VCC = 1.8V VIN = VCC or VSS 0.6 3.0 µA

DC Characteristics

Note: 1 VIL min and VIH max are reference only and are not tested

Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, VCC = +1.8V

Pin Capacitance

AT24C01

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Symbol Parameter 2.7-, 2.5-, 1.8-volt 5.0-volt

Units

tBUF Time the bus must be free before a new

Note: 1 This parameter is characterized and is not 100% tested

Device Operation

CLOCK and DATA TRANSITIONS: The SDA pin is

nor-mally pulled high with an external device Data on the SDA

pin may change only during SCL low time periods (refer to

Data Validity timing diagram) Data changes during SCL

high periods will indicate a start or stop condition as

de-fined below

START CONDITION: A high-to-low transition of SDA with

ACKNOWLEDGE: All addresses and data words are

se-rially transmitted to and from the E2PROM in 8 bit words Any device on the system bus receiving data (when com-municating with the E2PROM) must pull the SDA bus low

to acknowledge that it has successfully received each word This must happen during the ninth clock cycle after each word received and after all other system devices have freed the SDA bus The E2PROM will likewise

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ac-Bus Timing SCL: Serial Clock SDA: Serial Data I/O

Write Cycle Timing SCL: Serial Clock SDA: Serial Data I/O

Note: 1 The write cycle time tWR is the time from a valid stop condition of a write sequence to the end of the internal clear/write cycle

AT24C01

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Start and Stop Definition

Output Acknowledge

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Write Operations

BYTE WRITE: Following a start condition, a write

opera-tion requires a 7 bit data word address and a low write bit

Upon receipt of this address, the E2PROM will again

re-spond with a zero and then clock in the first 8 bit data

word Following receipt of the 8 bit data word, the

E2PROM will output a zero and the addressing device,

such as a microcontroller, must terminate the write

se-quence with a stop condition At this time the E2PROM

enters an internally-timed write cycle to the nonvolatile

memory All inputs are disabled during this write cycle and

the E2PROM will not respond until the write is complete

(refer to Figure 1)

PAGE WRITE: The AT24C01 is capable of a 4-byte page

write

A page write is initiated the same as a byte write but the

microcontroller does not send a stop condition after the

first data word is clocked in Instead, after the E2PROM

acknowledges receipt of the first data word, the

microcon-troller can transmit up to three more data words The

E2PROM will respond with a zero after each data word

received The microcontroller must terminate the page

write sequence with a stop condition (refer to Figure 2)

The data word address lower 2 bits are internally

incre-mented following the receipt of each data word The

higher five data word address bits are not incremented,

retaining the memory page row location If more than four

data words are transmitted to the E2PROM, the data word

address will “roll over” and previous data will be

overwrit-ten

ACKNOWLEDGE POLLING: Once the internally-timed

write cycle has started and the E2PROM inputs are dis-abled, acknowledge polling can be initiated This involves sending a start condition followed by the device address word The read/write bit is representative of the operation desired Only if the internal write cycle has completed will the E2PROM respond with a zero allowing the read or write sequence to continue

Read Operations

Read operations are initiated the same way as write op-erations with the exception that the read/write select bit in the device address word is set to one There are two read operations: byte read and sequential read

BYTE READ: A byte read is initiated with a start condition

followed by a 7 bit data word address and a high read bit The AT24C01 will respond with an acknowledge and then serially output 8 data bits The microcontroller does not respond with a zero but does generate a following stop condition (refer to Figure 3)

SEQUENTIAL READ: Sequential reads are initiated the

same as a byte read After the microcontroller receives an

8 bit data word, it responds with an acknowledge As long

as the E2PROM receives an acknowledge, it will continue

to increment the data word address and serially clock out sequential data words When the memory address limit is reached, the data word address will “roll over” and the se-quential read will continue The sese-quential read operation

is terminated when the microcontroller does not respond with an input zero but does generate a following stop con-dition (refer to Figure 4)

Figure 1 Byte Write

AT24C01

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Figure 4 Sequential Read

Figure 3 Byte Read

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t WR (max)

(ms)

I CC (max) (µA)

I SB (max) (µA)

f MAX (kHz) Ordering Code Package Operation Range

AT24C01-10SC-2.7 8S1 (0°C to 70°C)

AT24C01-10SI-2.7 8S1 (-40°C to 85°C)

AT24C01-10SC-2.5 8S1 (0°C to 70°C)

AT24C01-10SI-2.5 8S1 (-40°C to 85°C)

AT24C01-10SC-1.8 8S1 (0°C to 70°C)

AT24C01-10SI-1.8 8S1 (-40°C to 85°C)

Ordering Information

Package Type 8P3 8 Lead, 0.300" Wide, Plastic Dual Inline Package (PDIP)

8S1 8 Lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)

Options Blank Standard Operation (4.5V to 5.5V)

-2.7 Low Voltage (2.7V to 5.5V)

AT24C01

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